What minute, second in the animation does it occur? I converted Powerpoint slideshows into videos and my problem was this - https://vimeo.com/161348511/c529a947d2 - certain frames were omitted during conversion of the video - by Vimeo - to its own standards ... Show the moment when the flaw occurs, as it might be the same as mine was, and the solution I came up with, is first convert the PowerPoint created video (30.303 fps) to 60 fps - in that case the conversion by online video sites as Vimeo, Youtube to 30 fps doesn't omit any frames and so no jitter in the video.

I used Handbrake and the codec I converted to was .x265 - not x.264, as is more modern and significantly more reliable;